1867-1868
- 3 5 7 9 N O P Q R S T U V W X Y Z
2 4 6 8 . A B C D E F G H I J K L M
1868-1873
2 3 4 5 6 7 8 9 -
A E I . ? Y U O ,
B C D F G H J K L M
Z X W V T S R Q P N
1873-1878
2 3 4 5 6 7 8 9 - ,
Q W E . T Y I U O P
Z S D F G H J K L M
A X & C V B N ? ; R
From my report on the QWERTY keyboard.